Rubber compound.



No. raavio,

Patented LllebruarytBB, 1905.

rrlcs.

unseen dIPEUH ICATION forming par-tot Letters Patent No. 783,?10, dated February 28, 1905,

Application filed Januaryfifi, 19M. Renewed, January 21, 1905. Serial No. 242,14B.-

To all whom it mag concern:

Be it known that l, Ensnszes. W. STRAIN, a

citizen of the United States, residing at Philabine rosin with rubber or rubber substitutes in the manufacture of rubber goods, and this has been repeatedly attempted but the univer sal experience has been, so far-as my knowledge extends, that the rubber goods having rosin incorporated therewith would crack with age and be'rendered. useless. l have discovered that a distillate of rosin possesses a great at linity for rubber and when combined therewith forms a compound that will not crack witl age. in likemanner and with similar results it may also be combined with the class of goods or compoundsin general use known as rubber substitutes.

lln addition to the above discovery myinvention also relates to a novel compound composed of certain ingredients, including the distillateof rosin, which l find peculiarly adapt} ed for the purpose of providing a cheap cornpou nd that Will readily combine with rubber or rubber compounds.

in producing a compbund according to my invention l first take aquantlty of rosin and subject the same to a single distillation. ll neat take a quantity of clay china-olay preterred and after grinding the same to. a line powder mix it with linseed-oil until a pastelike mass is obtained free from lumps orgrit. A given quantity of this paste is then added to'the distillate oi rosin. ll then add to the resultant mass a quantity or rubber solution which is prepared, as usual, by dissolving raw rubber in benzin, turpentine, or rosin distillate. The proportions, by weight, of the ingredients used are as follows: Rosin distillate, eighty per cent.;linseedoil mixed with china-clay or other clay, ten per cent. rubber 5 solution, ten per cent. The ingredients named mixed in about the-proportions given are then placed in' an ordinary paint-mixer, which is maintained atv a temperature of about 150 Fahrenheit, and subjected to agitation until all the iugredientsare thoroughlycombined to form a homogeneous mass. The com- "pound is then removed from the mixer, al-

lowed to cool or partly cool, and then-manipulated or worked out in the manner familiar to those skilled in the art. The above compound possesses allot the characteristics of rubber, including the capability of being vulcanized, and may be cheaplyproduced. The rosin used iswhat is known as North 5 Carolina rosin. Uther kinds of rosin may of course be used but l find that named to be best suited for the purpose.

in order to render the'linseedbil non-oxidizable, so that it will not harden or crack, 7 beforehaving the clay admixed therewith, the oil is placed in a closed tank havinga vaporoutlet and is subjected to heat at a temperature oil 550 Fahrenheit for about ten hours without exposure to the air.

. The proportions named herein may of course be varied, and l do not, therefore, wish to be limited to the use of the ingredients in the proportions indicated, except so far as specified in the claims appended hereto.

' The above compound, forming. one part of my invention, will also serveto illustrate one manner of employing the distillate oi rosin. l wish it understood, however, that my invention contemplates the use of the rosin dis- 5 tillate with any combination of ingredients for forming rubber compounds or with rub her alone or with rubber substitutes.

The compound described is of an opaque or colorless nature and is especially adapted for 9 use in the manufacture of white rubber goods. lit can of course be used equally as well in the manufacture of dark rubber goods. The corn poundis not greasy and will therefore not worlc out to the surface of the goods. It is also of a nou-onidizable nature and will not become hard and liable to crack. Furthermore, the compound is of a fluid or semifluid consistency, enabling the manufacturer to readily combine therewith the harder and drier forms of rubber and rubber substitutes.

While 1 have found in the special compound named that a single distillate of rosin is desirable, I may employ a second or third distillate if the same be found of utility.

Having thus fully described my invention, what I claim as new isa 1. A rubber compound including as its chief ingredient a distillate'of rosin.

2. A rubber compound comprising a distil late of rosin having combined therewith linseed-oil, clay and a rubber solution.

3. A rubber compound comprising a'distillate of rosin having combined therewith linseed-oil, china-clay and a rubber solution, the ingredients being mixed in about the proportions stated.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

- v EBENEZER W. STRAIN. Witnesses: FRANCIS M. GARDNER,

E. F. LUMMIS. 

